using System;
using System.Collections.Generic;
using System.Text;

namespace virtualMethod
{
    class Program
    {
        static void Main( string [] args )
        {
           

            //A a = new B();

            //B b = new B();

            

            //a.a();
            //a.a_B();
            //a.a_C();

            //b.a();
            //b.a_B();
            //b.a_C();
            //b.b();
          


            Console.ReadLine();
        }
    }
}
